Up to four batches are being recalled from Asda, two from Superdrug and three from Tesco stores.

A statement on the Government's, Medicines and Healthcare products Regulatory Agency, website reads: "Penicillium brevicompactum and Penicillium corylophilum can produce mycotoxins. Reactions to these mycotoxins are rare in reported literature but there is a low risk they could induce non-specific toxin reactions that could include rashes, breathing difficulties and Gastro-Intestinal (GI) symptoms.

"There is also a low risk of allergen-mediated disease either through inhalation or ingestion of Penicillium antigens to occur, causing allergic symptoms."

The statement goes on to say: "It is important for people to check if they have any bottles from the batches of the blackcurrant cough syrups listed.

"If they do, they should not take them or give them to others. They should return any bottles of the batches above to the shop or pharmacy they bought it from.

"The mould is not always visible so they should return any bottles of the cough syrups from the batches above even if they can’t see the mould.

"Whilst the possibility of a reaction to the mould is low, if parents are concerned their child has had a reaction they should speak to their GP, pharmacist or other healthcare professional.

"As with any medicine, we strongly encourage anyone to report any suspected side effects to the MHRA via the Yellow Card Scheme ."